Note: Descriptions are shown in the official language in which they were submitted.
89028037
A composite polyurethane condom and a preparation method thereof
Technical Field
The invention belongs to the technical field of condoms, and specifically
relates to a
composite polyurethane condom and a preparation method thereof
Background
Due to the material characteristics of natural rubber latex, the thickness of
natural
rubber latex condoms is difficult to be less than 0.04 mm. At the same time,
natural rubber
latex contains a variety of proteins, and people with protein allergies may
have certain safety
risks. With the improvement of people's living standards, the demand for
condoms of
consumers is not only limited to the basic function of contraception, but more
pursuit of
condom use experience. Waterborne polyurethane condoms are new products on the
market
in recent years, but the flexibility of polyurethane materials has a certain
gap compared with
natural rubber. In order to integrate the characteristics of the two
materials, a product that
meets the needs of the public with thinness and flexibility is made. It adopts
physical
lamination method for production. Because natural rubber latex and waterborne
polyurethane are two polar materials, the adhesion between the two materials
is low during
lamination, the product is prone to delamination and cannot meet the design
requirements.
Summary
The present invention aims to provide a composite polyurethane condom and a
preparation method thereof For example, by adding a special adhesive layer
between the
two layers of materials, the two materials with different polarities can be
firmly attached
together without delamination.
In order to solve the above-mentioned problems, the present invention is
achieved
through the following technical solutions: the present invention provides a
composite
polyurethane condom, which at least comprises:
a first substrate layer;
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an adhesive layer formed on the first substrate layer;
a second substrate layer formed on the adhesive layer;
wherein, the adhesive layer includes an aliphatic sulfonated waterborne
polyurethane,
and the molecular chain of the aliphatic sulfonated waterborne polyurethane
contains amino
groups, sulfonic groups and carboxyl groups; the aliphatic sulfonated
waterborne
polyurethane has a 100% modulus less than or equal to 1.2 N/mm2, and the
adhesive layer
has a thickness of 0.1-20[tm.
In an embodiment, the first substrate layer includes any one of a natural
latex film, a
synthetic rubber film, a polyurethane film, and a polyisoprene film.
In an embodiment, the second substrate layer includes any one of a natural
latex film,
a synthetic rubber film, a polyurethane film, and a polyisoprene film.
In an embodiment, the aliphatic sulfonated waterborne polyurethane includes a
polyether/polyester polyol, an aliphatic isocyanate, a crosslinking agent, a
small molecule
chain extender and a hydrophilic chain extender.
In an embodiment, the polyether/polyester polyol has a molecular weight of 400-
6000,
and the polyether/polyester polyol includes any one of polyoxypropylene
glycol,
polytetramethylene ether glycol, poly(neopentyl glycol adipate), poly 1,4-
butanediol
adipate, poly 1,6-hexanediol adipate, polycaprolactone and polycarbonate or a
combination
thereof
In an embodiment, the aliphatic isocyanate includes any one of hexamethylene
diisocyanate (HDI), isophorone diisocyanate (IPDI), dicyclohexylmethane-4,4'-
diisocyanate (HMDI), and other aliphatic isocyanates or a combination thereof
In an embodiment, the crosslinking agent includes any one of
trimethylolpropane,
silanes, neopentyl glycol, and castor oil or a combination thereof
In an embodiment, the hydrophilic chain extender is any one of sodium
ethylenediaminoethanesulfonate and dimethylolpropionic acid (DMPA) or a
combination
thereof
In an embodiment, the adhesive layer has a number average molecular weight of
20,000-60,000 g/mol.
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In an embodiment, the composite polyurethane condom further includes:
a second adhesive layer formed on the second substrate layer;
a third substrate layer formed on the second adhesive layer.
In an embodiment, the adhesive layer has an elongation at break greater than
or equal
to 500%.
In an embodiment, the condom has a thickness of 0.01-0.068 mm.
In an embodiment, the number of layers of the condom is 3-6.
In an embodiment, the aliphatic sulfonated waterborne polyurethane further
includes
silyl (silane groups) and/or hydroxyl groups in its molecular chain.
Another object of the present invention is to provide a method for preparing a
composite polyurethane condom, which at least includes the following steps:
providing a mold;
forming a first substrate layer on the mold;
forming an adhesive layer on the first substrate layer;
forming a second substrate layer on the adhesion layer;
demoulding to obtain the composite polyurethane condom;
wherein, the adhesive layer comprises aliphatic sulfonated waterborne
polyurethane,
and the aliphatic sulfonated waterborne polyurethane contains amino groups,
sulfonic
groups and carboxyl groups in its molecular chain, and the aliphatic
sulfonated waterborne
polyurethane has a 100% modulus less than or equal to 1.2 N/mm2, and the
adhesive layer
has a thickness of 0.1-20[Im.
In an embodiment, the mold is removed by using mold release solution in water
containing a release agent.
In the present invention, by adding a special adhesive layer between the two
layers of
materials, the two materials with different polarities can be firmly attached
together without
delamination. In the present invention, the film materials on both sides of
the adhesive layer
are attached together, so that each film material can exert its own material
advantages. The
adhesive layer of the present invention has low modulus, high adhesiveness,
high
compatibility, high resilience and high adhesion. It combines materials with
different
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properties through the boundary bridge effect, so that the condom of the
present invention
can be soaked in hot alkaline water or hot water at 50-70 C for 1-10 minutes
without
delamination. In the present invention, for example, by the interaction
between amino,
sulfonic and carboxyl groups, it can react or form good adhesion with
polyurethane or
non-polar materials, so that the adhesive layer and the materials on both
sides have strong
adhesion, and further ensures that no delamination will occur.
Description of the drawings
Figure 1 is a schematic diagram of a composite polyurethane condom with a
three-layer
structure in an embodiment of the present invention;
Figure 2 is a schematic flow diagram of the method in an embodiment of the
present
invention;
Figure 3 is a schematic diagram of a composite polyurethane condom with a 5-
layer
structure in an embodiment of the present invention.
Symbol Description
101 First substrate layer
102 Adhesive layer
103 Second substrate layer
104 Second adhesive layer
105 Third substrate layer
Detailed Description
The present invention will be further described through several specific
embodiments
below, but it should be noted that the specific material ratio, process
conditions and results
described in the embodiments of the present invention are only used to
illustrate the present
invention, and cannot be used to limit the protection scope of the present
invention, and all
equivalent changes or modifications made according to the spirit of the
present invention
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should be included in the protection scope of the present invention. It should
be noted that
unless otherwise specified, the "%" described herein refers to "parts by
mass".
In the present invention, it should be noted that if the terms "center", "up",
"down",
"left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the
indicated orientation
or position relationship is based on the orientation or position relationship
shown in the
figures, which is only for the convenience of describing the application and
simplifying the
description, rather than indicating or implying that the device or element
referred to be
required with a specific orientation, be constructed and operated in a
specific orientation,
and therefore cannot be construed as a limitation of the application. In
addition, if the terms
"first" and "second" appear, they are only used for descriptive and
distinguishing purposes,
and cannot be understood as indicating or implying relative importance.
The present invention provides a composite polyurethane condom and a
preparation
method thereof By adding a special adhesive layer between the two layers of
materials, for
example, two materials with different polarities can be firmly attached
together, so that the
condom of the present invention can be soaked in hot alkaline water or hot
water at 50-70 C
for 1-10 minutes without delamination.
As shown in figure 2, it is a schematic flow diagram of a method for preparing
a
composite polyurethane condom in an embodiment of the present invention, which
includes
at least the following steps:
Si. providing a mold;
S2. forming a first substrate layer on the mold;
S3. forming an adhesive layer on the first substrate layer;
S4. forming a second substrate layer on the adhesion layer;
S5. demoulding to obtain the composite polyurethane condom;
wherein, the adhesive layer comprises aliphatic sulfonated waterborne
polyurethane,
the aliphatic sulfonated waterborne polyurethane contains amino groups,
sulfonic groups
and carboxyl groups in its molecular chain;, the aliphatic sulfonated
waterborne
polyurethane has a 100% modulus less than or equal to 1.2 N/mm2, and the
adhesive layer
has a thickness of 0.1-20[tm.
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Specifically, in step Si, for example, the mold is a condom mold of glass or
other
materials.
Specifically, in step S2, for example, the surface of the mold is heated to 30-
40 C, and
then the mold is immersed in an immersion liquid containing the material of
the first
substance layer 101, and for example, the immersion time is 35-60 seconds.
After the
immersion is completed, it is taken out. For example, it can be dried at 90-
110 C, and it can
be immersed repeatedly. The material of the first substrate layer 101 is, for
example, any
one of a natural latex film, a synthetic rubber film, a polyurethane film and
a polyisoprene
film.
Specifically, in step S3, the mold, on which the first substrate layer 101 is
formed, is
immersed in a liquid containing the material of adhesive layer 102, and for
example, the
immersion time is 35-60 seconds. After the immersion is completed, it is taken
out. For
example, it can be dried at 80-120 C, and it can be immersed repeatedly to
form the adhesive
layer 102. The material of the adhesive layer 102 includes, for example,
aliphatic sulfonated
waterborne polyurethane. Specifically, for example, the thickness of the
adhesive layer 102
is 0.1-10p,m.
Specifically, in step S4, the mold, on which the adhesive layer 102 is formed,
is
immersed in a liquid containing the material of the second substrate layer
103, and for
example, the immersion time is 35-60 seconds. After the immersion is
completed, it is taken
out. For example, it can be dried at 100-140 C, and it can be immersed
repeatedly to form
the second substrate layer 103. For example, the material of the first
substrate layer 101 is
any one of a natural latex film, a synthetic rubber film, a polyurethane film
and a
polyisoprene film. The materials of the first substrate layer 101 and the
second substrate
layer 103 have, for example, different polarities or the same polarities. The
adhesive layer
102 of the present invention combines materials with different properties
through a
boundary bridge effect, so that, for example, two materials with different
polarities can be
firmly attached together.
Specifically, in step S5, for example, a hot alkaline water is used to swell
the
polyurethane condom, and the polyurethane condom is demolded by water
flushing, for
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example, a release agent is added to the demolding water to remove the mold,
and then the
mold is dried by, for example, a dryer to obtain the composite polyurethane
condom. The
composite polyurethane condom is, for example, four-layer, five-layer, six-
layer and other
different layers. The adhesive layer 102 serves as one or two layers in the
middle, and the
two sides of each layer of the adhesive layers are respectively laminated with
other material
films.
As shown in figure 1, an embodiment of the present invention also provides a
composite polyurethane condom with the thickness of 0.01-0.068 mm. The number
of layers
of the condom is, for example, 3 to 6 layers. Specifically, it includes at
least: a first substrate
layer 101, an adhesive layer 102 and a second substrate layer 103. Among them,
the adhesion
layer 102 is formed on the first substrate layer 101. The second substrate
layer 103 is formed
on the adhesion layer 102. Among them, the adhesive layer 102 includes, for
example,
aliphatic sulfonated waterborne polyurethane. The molecular chain of the
aliphatic
sulfonated waterborne polyurethane contains unsaturated double bonds, amino
groups,
sulfonic acid groups and carboxyl groups, which can chemically interact with
the first
substrate layer 101 and the second substrate layer 103 to form, for example, a
chemical
bond. In another embodiment, the molecular chain of the aliphatic sulfonated
waterborne
polyurethane further includes, for example, silyl (silane groups) and/or
hydroxyl groups.
100% modulus of the aliphatic sulfonated waterborne polyurethane is less than
or equal to
1.2 N/mm2, the thickness of the adhesive layer is 0.1-20pm, and the elongation
at break of
the adhesive layer is, for example, greater than or equal to 500%. The first
substrate layer
101 includes, for example, any one of a natural latex film, a synthetic rubber
film, a
polyurethane film, and a polyisoprene film. The second substrate layer 103
includes, for
example, any one of a natural latex film, a synthetic rubber film, a
polyurethane film, and a
polyisoprene film. The polarities of the materials of the first base material
layer 101 and the
second base material layer 103 are, for example, different. The material of
the adhesive layer
102 of the present invention is, for example, an aliphatic polyester
waterborne polyurethane
material, which is synthesized by polyester polyol, and has strong adhesion to
polar and
non-polar materials, and has the characteristics of flexibility and high
elongation. 100%
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modulus is less than or equal to 1.2Nimm2, and the elongation at break is
greater than or
equal to 500%. In an embodiment, the aliphatic sulfonated waterborne
polyurethane
includes polyether/polyester polyol, aliphatic isocyanate, crosslinking agent,
small molecule
chain extender and hydrophilic chain extender. In an embodiment, the molecular
weight of
the polyether/polyester polyol is 400-6000, and the polyether/polyester polyol
includes any
one or a combination of polyoxypropylene glycol, polytetramethylene ether
glycol,
poly(neopentyl glycol adipate), poly 1,4-butanediol adipate, poly 1,6-
hexanediol adipate,
polycaprolactone and polycarbonate. In an embodiment, the aliphatic isocyanate
includes
one or a combination of hexamethylene diisocyanate (HDI), isophorone
diisocyanate
(IPDI), dicyclohexylmethane-4,4'-diisocyanate (HMDI), and other aliphatic
isocyanates. In
an embodiment, the crosslinking agent includes any one or a combination of
trimethylolpropane, silanes, neopentyl glycol, and castor oil. In an
embodiment, the
hydrophilic chain extender is any one or a combination of sodium
ethylenediaminoethanesulfonate and dimethylolpropionic acid (DMPA). For
example, in the
present invention, when natural rubber latex and waterborne polyurethane are
laminated,
adding an adhesive layer between the two layers is an effective method to
overcome the
defects of the prior art. For example, the number average molecular weight of
the adhesion
layer is 20,000-60,000 g/mol, which is beneficial to promote, for example, a
strong adhesion
between the first substrate layer 101 and the adhesion layer 102, as well as
the second
substrate layer 103 and the adhesive layer 102.
As shown in figure 3, in some embodiments, the composite polyurethane condom
further includes, for example, a second adhesive layer 104 and a third
substrate layer 105.
Among them, the second adhesive layer 104 is formed on the second substrate
layer 103,
the third substrate layer 105 is formed on the second adhesive layer 102, and
the polarities
of the third substrate layer 105 and the second substrate layer 103 are, for
example, the same
or different. The third substrate layer 105 is, for example, any one of a
natural latex film, a
synthetic rubber film, a polyurethane film, and a polyisoprene film.
As shown in figure 1, in some embodiments, the first substrate layer 101 is,
for
example, a natural latex film or a synthetic rubber film, and the adhesive
layer 102 is, for
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example, aliphatic sulfonated waterborne polyurethane containing unsaturated
double
bonds, amino groups and carboxyl groups in the molecular chain. 100% modulus
of the
aliphatic sulfonated waterborne polyurethane is less than or equal to
1.2N/mm2, and the
thickness of the adhesive layer is 0.1-201.1m. The material of the second
substrate layer 103
is, for example, a polyurethane film. In other embodiments, the first
substrate layer 101 is,
for example, a natural latex film or a synthetic rubber film, and the adhesion
layer 102 is,
for example, an aliphatic sulfonated waterborne polyurethane containing
unsaturated double
bonds, amino groups and carboxyl groups in the molecular chain. 100% modulus
of the
aliphatic sulfonated waterborne polyurethane is less than or equal to
1.2N/mm2, the
thickness of the adhesive layer is 0.1-201.1m. The material of the second
substrate layer 103
is, for example, a polyisoprene (PI) film. In still other embodiments, the
first substrate layer
101 is a polyisoprene (PI) film, such as a water-based polyurethane film, and
the adhesive
layer 102 is, for example, a waterborne polyurethane film. The adhesion layer
102 is, for
example, an aliphatic sulfonated waterborne polyurethane containing
unsaturated double
bonds, amino groups and carboxyl groups in the molecular chain. 100% modulus
of the
aliphatic sulfonated waterborne polyurethane is less than or equal to
1.2N/mm2, and the
thickness of the adhesive layer is 0.1-201.1m. The material of the second
substrate layer 103
is, for example, a polyisoprene (PI) film.
Some examples are listed below to specifically illustrate the present
invention.
As referred to the data in table 1, in an example, for example, the condom
mold of glass
or of other materials is cleaned. The surface of the mold is heated to 30-40
C, and then the
mold is immersed in a latex liquid. For example, the latex liquid is a latex
liquid containing
natural rubber latex, synthetic rubber. For example, the immersion time is 35-
60 seconds.
After the immersion is completed, it is taken out and dried at, for example,
90-110 C, and it
can be immersed repeatedly to form the latex layer A. Next, the mold on which
the latex
layer is formed is immersed in the liquid containing the material of the
adhesive layer A.
For example, the immersion time is 35-60 seconds. After the immersion is
completed, it is
taken out and dried at, for example, 80-120 C, and it can be immersed
repeatedly to form
the adhesive layer A. The material of the adhesive layer A includes, for
example, aliphatic
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sulfonated waterborne polyurethane, specifically, for example, aliphatic
polyester type
waterborne polyurethane, and for example, the thickness of the adhesive layer
A is
controlled to be 0.1-10p.m. Then, the mold on which the adhesive layer A is
formed is
immersed in a liquid containing waterborne polyurethane. For example, the
immersion time
is 35-60 seconds. After the immersion is completed, it is taken out and dried
at, for example,
100-140 C, and it can be immersed repeatedly to form the waterborne
polyurethane layer A.
Crimping treatment is carried out. After crimping, it is dried at 120-140 C,
swelled with hot
alkaline water, demould with water flushing. Release agent is added in
demolding water,
and it is dried through a dryer to obtain the composite polyurethane condom A.
In this
example, one side is a latex material, and the other side is a waterborne
polyurethane
material, which are two materials with different polarities.
As referred to the data in table 1, in another example, both sides of the
adhesive layer
B in this example are adhered with latex materials, which are materials with
the same
polarity. For example, the condom mold of glass or of other materials is
cleaned, and the
surface of the mold is heated to 30-40 C, and the mold is immersed in the
latex liquid. For
example, the latex liquid is a latex liquid containing natural rubber latex,
synthetic rubber.
For example, the immersion time is 35-60 seconds. After the immersion is
completed, it is
taken out and dried at, for example, 90-110 C, and it can be immersed
repeatedly to form
the latex layer B. Next, the mold on which the latex layer is formed is
immersed in the liquid
containing the material of the adhesive layer. For example, the immersion time
is 35-60
seconds. After the immersion is completed, it is taken out and dried at, for
example,
80-100 C, and it can be immersed repeatedly to form the adhesive layer B. The
material of
the adhesive layer B includes, for example, aliphatic sulfonated waterborne
polyurethane,
specifically, for example, aliphatic polyester type waterborne polyurethane,
and for
example, the thickness of the adhesive layer B is controlled to be 0.1-10ttm.
Then, the mold
on which the adhesive layer B is formed is immersed in a liquid containing
latex liquid Bl.
For example, the immersion time is 35-60 seconds. After the immersion is
completed, it is
taken out and dried at, for example, 90-110 C, and it can be immersed
repeatedly to form
the the latex liquid Bl. Crimping treatment is carried out. After crimping, it
is dried at
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100-120 C, swelled with hot alkaline water, demould with water flushing.
Release agent is
added in demolding water, and it is dried through a dryer to obtain the
composite
polyurethane condom B.
As referred to the data in table 1, in another embodiment, both sides of the
adhesive
layer C in this embodiment are adhered with waterborne polyurethane materials,
which are
materials with the same polarity. For example, the condom mold of glass or of
other
materials is cleaned, and the surface of the mold is heated to 30-40 C, and
the mold is
immersed in the liquid Cl containing waterborne polyurethane. For example, the
immersion
time is 35-60 seconds. After the immersion is completed, it is taken out and
dried at, for
example, 90-110 C, and it can be immersed repeatedly to form the waterborne
polyurethane
layer Cl. Next, the mold on which the waterborne polyurethane layer Cl is
formed is
immersed in the liquid containing the material of the adhesive layer C. For
example, the
immersion time is 35-60 seconds. After the immersion is completed, it is taken
out and dried
at, for example, 80-100 C, and it can be immersed repeatedly to form the
adhesive layer C.
The material of the adhesive layer C includes, for example, aliphatic
sulfonated waterborne
polyurethane, specifically, for example, aliphatic polyester type waterborne
polyurethane,
and for example, the thickness of the adhesive layer C is controlled to be 0.1-
10pm. Then,
the mold on which the adhesive layer C is formed is immersed in a liquid C2
containing
waterborne polyurethane. For example, the immersion time is 35-60 seconds.
After the
immersion is completed, it is taken out and dried at, for example, 100-120 C,
and it can be
immersed repeatedly to form the waterborne polyurethane layer C2. Crimping
treatment is
carried out. After crimping, it is dried at 120-140 C, swelled with hot
alkaline water,
demould with water flushing. Release agent is added in demolding water, and it
is dried
through a dryer to obtain the composite polyurethane condom C.
As referred to the data in table 1, in another example, one side of the
adhesive layer C
in this example is adhered with latex materials, and the other side is adhered
with
polyisoprene (PI), which are materials with different polarity. For example,
the condom
mold of glass or of other materials is cleaned, and the surface of the mold is
heated to
30-40 C, and the mold is immersed in the latex liquid. For example, the latex
liquid is a
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latex liquid containing natural rubber latex, synthetic rubber. For example,
the immersion
time is 35-60 seconds. After the immersion is completed, it is taken out and
dried at, for
example, 90-110 C, and it can be immersed repeatedly to form the latex layer
D. Next, the
mold on which the latex layer is formed is immersed in the liquid containing
the material of
the adhesive layer D. For example, the immersion time is 35-60 seconds. After
the
immersion is completed, it is taken out and dried at, for example, 80-120 C,
and it can be
immersed repeatedly to form the adhesive layer D. The material of the adhesive
layer D
includes, for example, aliphatic sulfonated waterborne polyurethane,
specifically, for
example, aliphatic polyester type waterborne polyurethane, and for example,
the thickness
of the adhesive layer D is controlled to be 0.1-10pm. Then, the mold on which
the adhesive
layer D is formed is immersed in a liquid containing polyisoprene (PI). For
example, the
immersion time is 35-60 seconds. After the immersion is completed, it is taken
out and dried
at, for example, 100-140 C, and it can be immersed repeatedly to form the
polyisoprene
layer D. Crimping treatment is carried out. After crimping, it is dried at 120-
140 C, swelled
with hot alkaline water, demould with water flushing. Release agent is added
in demolding
water, and it is dried through a dryer to obtain the composite polyurethane
condom D.
The composite polyurethane condoms obtained in the foregoing examples and
comparative examples of the present invention were tested for related
performance, and the
test results are shown in Table 1.
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Table 1. Performance Test
Composite Composite Composite Composite
polyurethane polyurethane polyurethane polyurethane
condom A condom B condom C condom D
Thickness (mm) 0.01 0.01 0.01 0.01
100%
0.5 1.2 0.7 0.5
modulus(N/mm2)
Soaked in hot Soaked in hot Soaked in hot Soaked in hot
alkaline alkaline alkaline alkaline
Physical water or hot water or hot water or hot
water or hot
properties Adhesion water at 50- water at 50- water at 50-
water at 50-
70 C for 1-10 70 C for 1-10 70 C for 1-10 70 C for 1-10
minutes, no minutes, no minutes, no minutes, no
delamination delamination delamination delamination
Elongation at
700 550 500 700
break (%)
It can be seen from the data in Table 1 and the examples that by adding a
special
adhesive layer between the two layers of materials, the two materials with
different polarities
can be firmly attached together, such that after the condom of the present
invention is soaked
in hot alkaline water or hot water at 50-70 C for 1-10 minutes, there will be
no delamination
phenomenon. When materials with different polarities are adhered on both sides
of the
adhesive layer, the advantages of materials with different polarities can be
maximized, so
that the obtained composite polyurethane condom has low modulus, high
adhesion, high
compatibility, high resilience and high adhesion. For example, after soaking
in hot alkaline
water or hot water at 50-70 C for 1-10 minutes without delamination, for
example, the
elongation at break can reach as high as 700%, 550%.
In summary, in the present invention, by adding a special adhesive layer
between the
two layers of materials, the two materials with different polarities can be
firmly attached
together without delamination. In the present invention, the film materials on
both sides of
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the adhesive layer are attached together, so that each film material can exert
its own material
advantages. The adhesive layer of the present invention has low modulus, high
adhesiveness, high compatibility, high resilience and high adhesion. It
combines materials
with different properties through the boundary bridge effect, so that the
condom of the
present invention can be soaked in hot alkaline water or hot water at 50-70 C
for
1-10 minutes, and there will be no delamination phenomenon. In the present
invention, for
example, by the interaction between unsaturated double bonds, amino groups,
sulfonic acid
groups, and carboxyl groups, it can react with, for example, polyurethane or
vinyl, so that
there is strong adhesion between the adhesive layer and the materials on both
sides thereof,
and further ensures that no delamination will occur.
The above descriptions are only preferred examples of the present invention,
and are
not intended to limit the present invention in any form or substantially. It
should be pointed
out that for those of ordinary skill in the art, without departing from the
method of the present
invention, several improvements and supplements can be made, and these
improvements
and supplements should also be regarded as the protection scope of the present
invention.
Anyone who is skilled in the art, without departing from the spirit and scope
of the present
invention, can make use of the technical content disclosed above to make minor
changes,
modifications and evolutionary equivalent changes, all of which are equivalent
embodiments of the present invention; at the same time, any changes,
modifications and
evolutions made to the above-mentioned embodiments based on the essential
technology of
the present invention are still within the scope of the technical solutions of
the present
invention.
14
Date recue /Date received 2021-11-26
